EP0597109A4 - Hydraulically driving system. - Google Patents
Hydraulically driving system.Info
- Publication number
- EP0597109A4 EP0597109A4 EP9393905623A EP93905623A EP0597109A4 EP 0597109 A4 EP0597109 A4 EP 0597109A4 EP 9393905623 A EP9393905623 A EP 9393905623A EP 93905623 A EP93905623 A EP 93905623A EP 0597109 A4 EP0597109 A4 EP 0597109A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- hydraulic pump
- pressure
- change
- unloading valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
- F15B2211/20584—Combinations of pumps with high and low capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/35—Directional control combined with flow control
- F15B2211/351—Flow control by regulating means in feed line, i.e. meter-in control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41563—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/605—Load sensing circuits
- F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
- F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5076592 | 1992-03-09 | ||
JP50765/92 | 1992-03-09 | ||
PCT/JP1993/000287 WO1993018308A1 (en) | 1992-03-09 | 1993-03-09 | Hydraulically driving system |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0597109A1 EP0597109A1 (en) | 1994-05-18 |
EP0597109A4 true EP0597109A4 (en) | 1994-08-24 |
EP0597109B1 EP0597109B1 (en) | 1996-12-18 |
Family
ID=12867937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93905623A Expired - Lifetime EP0597109B1 (en) | 1992-03-09 | 1993-03-09 | Hydraulically driving system |
Country Status (6)
Country | Link |
---|---|
US (1) | US5394697A (en) |
EP (1) | EP0597109B1 (en) |
JP (1) | JP3204977B2 (en) |
KR (1) | KR970000243B1 (en) |
DE (1) | DE69306738T2 (en) |
WO (1) | WO1993018308A1 (en) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3664733B2 (en) * | 1995-07-10 | 2005-06-29 | 日立建機株式会社 | Hydraulic drive |
US5540049A (en) * | 1995-08-01 | 1996-07-30 | Caterpillar Inc. | Control system and method for a hydraulic actuator with velocity and force modulation control |
JP3545111B2 (en) * | 1995-09-27 | 2004-07-21 | 日立建機株式会社 | Constant pressure control hydraulic drive |
JP3677296B2 (en) * | 1995-10-09 | 2005-07-27 | 新キャタピラー三菱株式会社 | Construction machine control equipment |
US5937645A (en) * | 1996-01-08 | 1999-08-17 | Nachi-Fujikoshi Corp. | Hydraulic device |
JP3609182B2 (en) * | 1996-01-08 | 2005-01-12 | 日立建機株式会社 | Hydraulic drive unit for construction machinery |
US5680760A (en) * | 1996-03-28 | 1997-10-28 | Caterpillar Inc. | Hydraulic drive system |
KR0174397B1 (en) * | 1996-05-30 | 1999-04-15 | 토니헬샴 | Engine pump control device in a loader |
US5743089A (en) * | 1996-07-25 | 1998-04-28 | Kabushiki Kaisha Kobe Seiko Sho | Hydraulic control system |
WO1998022717A1 (en) * | 1996-11-21 | 1998-05-28 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive apparatus |
US5880957A (en) * | 1996-12-03 | 1999-03-09 | Caterpillar Inc. | Method for programming hydraulic implement control system |
KR100240086B1 (en) * | 1997-03-22 | 2000-01-15 | 토니헬 | Automatic fluid pressure intensifying apparatus and method of a hydraulic travelling device |
US6209321B1 (en) * | 1997-08-29 | 2001-04-03 | Komatsu Ltd. | Hydraulic controller for a working machine |
US6173572B1 (en) * | 1999-09-23 | 2001-01-16 | Caterpillar Inc. | Method and apparatus for controlling a bypass valve of a fluid circuit |
US7155909B2 (en) * | 2003-05-15 | 2007-01-02 | Kobelco Construction Machinery Co., Ltd. | Hydraulic controller for working machine |
KR100578976B1 (en) | 2004-10-15 | 2006-05-12 | 삼성에스디아이 주식회사 | Multilayer having an excellent adhesion and a methof for fabricating method the same |
JP2007205464A (en) * | 2006-02-01 | 2007-08-16 | Bosch Rexroth Corp | Control method of variable displacement pump |
US7857070B2 (en) * | 2006-04-18 | 2010-12-28 | Deere & Company | Control system using a single proportional valve |
US8869520B2 (en) | 2007-11-21 | 2014-10-28 | Volvo Construction Equipment Ab | Load sensing system, working machine comprising the system, and method for controlling a hydraulic function |
RU2453658C2 (en) * | 2007-11-21 | 2012-06-20 | Вольво Констракшн Эквипмент Аб | Load-susceptible system, machine incorporating it and method of controlling hydraulic drive |
JP2010276162A (en) * | 2009-05-29 | 2010-12-09 | Komatsu Ltd | Working machine |
US8607559B2 (en) * | 2009-12-29 | 2013-12-17 | Eaton Corporation | Fluid bypass system |
US8844280B2 (en) | 2011-02-28 | 2014-09-30 | Caterpillar Inc. | Hydraulic control system having cylinder flow correction |
CN103415709B (en) * | 2011-03-07 | 2016-01-20 | 沃尔沃建造设备有限公司 | For the oil hydraulic circuit of Pipelayer |
JP5631830B2 (en) | 2011-09-21 | 2014-11-26 | 住友重機械工業株式会社 | Hydraulic control device and hydraulic control method |
WO2013080825A1 (en) * | 2011-11-29 | 2013-06-06 | 日立建機株式会社 | Construction machine |
US9272787B2 (en) * | 2012-11-05 | 2016-03-01 | Hamilton Sundstrand Corporation | Flow reduction for bleed air systems |
CN103398034B (en) * | 2013-08-15 | 2015-08-26 | 中机美诺科技股份有限公司 | A kind of hydraulic control system for Sowing machine for potatoes |
CN104709834B (en) * | 2013-12-11 | 2017-08-04 | 北汽福田汽车股份有限公司 | Turn round speed-adjusting and control system and crane |
JP6189762B2 (en) * | 2014-01-31 | 2017-08-30 | 株式会社Kcm | Hydraulic control device |
CN103982476B (en) * | 2014-05-27 | 2016-02-10 | 湖南联智桥隧技术有限公司 | A kind of hydraulic control circuit |
AU2016424594A1 (en) * | 2016-09-27 | 2019-03-28 | Boatland Investments Pty Ltd | Apparatus and method for actuating a hydraulic cylinder |
EP3594507A4 (en) * | 2017-03-10 | 2020-04-29 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel |
JP6912947B2 (en) * | 2017-06-14 | 2021-08-04 | 川崎重工業株式会社 | Hydraulic system |
JP6853740B2 (en) * | 2017-06-16 | 2021-03-31 | 川崎重工業株式会社 | Hydraulic system |
JP7169046B2 (en) * | 2019-02-18 | 2022-11-10 | キャタピラー エス エー アール エル | Hydraulic control circuit of working machine |
EP3546955B1 (en) * | 2019-05-24 | 2021-12-08 | Sensirion AG | Duct sensor with duct probe for sampling a fluid from a duct and method of operation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990010795A1 (en) * | 1989-03-13 | 1990-09-20 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving unit for working machine |
US4977928A (en) * | 1990-05-07 | 1990-12-18 | Caterpillar Inc. | Load sensing hydraulic system |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4426194A (en) * | 1981-03-06 | 1984-01-17 | Sundstrand Corporation | Viscosity compensating circuits |
JPS57154501A (en) * | 1981-03-19 | 1982-09-24 | Daikin Ind Ltd | Mode-changeable flow control circuit |
AU552866B2 (en) * | 1981-05-18 | 1986-06-26 | Deere & Company | Power-on-demand hydraulic system |
DE3321483A1 (en) * | 1983-06-14 | 1984-12-20 | Linde Ag, 6200 Wiesbaden | HYDRAULIC DEVICE WITH ONE PUMP AND AT LEAST TWO OF THESE INACTED CONSUMERS OF HYDRAULIC ENERGY |
US4694647A (en) * | 1986-03-28 | 1987-09-22 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic circuit system for use in hydraulically operated vehicles |
DE3716200C2 (en) * | 1987-05-14 | 1997-08-28 | Linde Ag | Control and regulating device for a hydrostatic drive unit and method for operating one |
JP2612452B2 (en) * | 1987-07-20 | 1997-05-21 | 株式会社神戸製鋼所 | Manufacturing method of high ductility and high strength cold rolled steel sheet |
JPH01110883A (en) * | 1987-10-23 | 1989-04-27 | Kawasaki Heavy Ind Ltd | Control device for variable displacement pump |
JP2622401B2 (en) * | 1988-06-10 | 1997-06-18 | 東芝機械株式会社 | Hydraulic flow control device |
JPH07103883B2 (en) * | 1989-04-17 | 1995-11-08 | 日立建機株式会社 | Load sensing hydraulic drive circuit controller |
JPH0374607A (en) * | 1989-08-16 | 1991-03-29 | Komatsu Ltd | Hydraulic circuit |
JPH0758081B2 (en) * | 1989-10-09 | 1995-06-21 | 日立建機株式会社 | Hydraulic drive system |
-
1993
- 1993-03-09 WO PCT/JP1993/000287 patent/WO1993018308A1/en active IP Right Grant
- 1993-03-09 DE DE69306738T patent/DE69306738T2/en not_active Expired - Lifetime
- 1993-03-09 EP EP93905623A patent/EP0597109B1/en not_active Expired - Lifetime
- 1993-03-09 JP JP51437593A patent/JP3204977B2/en not_active Expired - Fee Related
- 1993-03-09 KR KR1019930703299A patent/KR970000243B1/en not_active IP Right Cessation
- 1993-10-04 US US08/130,906 patent/US5394697A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990010795A1 (en) * | 1989-03-13 | 1990-09-20 | Hitachi Construction Machinery Co., Ltd. | Hydraulic driving unit for working machine |
US4977928A (en) * | 1990-05-07 | 1990-12-18 | Caterpillar Inc. | Load sensing hydraulic system |
Non-Patent Citations (1)
Title |
---|
See also references of WO9318308A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69306738T2 (en) | 1997-04-03 |
WO1993018308A1 (en) | 1993-09-16 |
US5394697A (en) | 1995-03-07 |
KR970000243B1 (en) | 1997-01-08 |
DE69306738D1 (en) | 1997-01-30 |
JP3204977B2 (en) | 2001-09-04 |
EP0597109A1 (en) | 1994-05-18 |
EP0597109B1 (en) | 1996-12-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0597109A4 (en) | Hydraulically driving system. | |
CA1140835A (en) | Series parallel selector for steering and implement | |
EP0795690A4 (en) | Hydraulic driving device | |
US3987622A (en) | Load controlled fluid system having parallel work elements | |
CA2034613A1 (en) | Energy regenerative circuit in a hydraulic apparatus | |
EP0362409A4 (en) | Hydraulic driving unit | |
CA2255991A1 (en) | Hydraulic control valve system with load sensing priority | |
JPH045841B2 (en) | ||
JPS5464332A (en) | Automotive power steering device | |
DE102013222953A1 (en) | Hydraulic drive device for a work machine | |
JPH0459483B2 (en) | ||
US3946562A (en) | Hydraulic system cavitation suppressor | |
US5291676A (en) | Hydraulic drive system | |
EP0551513A4 (en) | Hydraulic drive system in construction machine. | |
US4444297A (en) | Control system for a fluid pressure engaged clutch | |
EP1504194B1 (en) | Hydraulic system comprising pressure-controlled damping means | |
US3091929A (en) | Regenerative hydraulic circuit | |
US5299421A (en) | Device for controlling variable capacity motor of hydraulic drive vehicle | |
EP0781923A4 (en) | Capacity controller of variable capacity hydraulic pump | |
KR950014497A (en) | Automatic sequential boosting system of hydraulic circuit | |
JP3768566B2 (en) | Hydraulic pump discharge flow control device | |
JPH01261503A (en) | Two speed lift mechanism for industrial vehicle | |
CN111648292A (en) | Wash width adjustable sanitation car low pressure water route | |
JP3067536B2 (en) | Hydraulic power source device | |
DE4118532C2 (en) | Waterworks control system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19931004 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE GB IT |
|
A4 | Supplementary search report drawn up and despatched | ||
AK | Designated contracting states |
Kind code of ref document: A4 Designated state(s): DE FR GB IT SE |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19960409 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE GB IT |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE GB IT |
|
REF | Corresponds to: |
Ref document number: 69306738 Country of ref document: DE Date of ref document: 19970130 |
|
ITF | It: translation for a ep patent filed |
Owner name: 0403;04MIFMODIANO & ASSOCIATI S.R.L. |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20100316 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20100303 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20100318 Year of fee payment: 18 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20110309 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111001 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 69306738 Country of ref document: DE Effective date: 20111001 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110309 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110309 |